1. British Heart Foundation Glasgow Cardiovascular Research Centre, University of Glasgow, Glasgow, United Kingdom
2. West of Scotland Heart and Lung Centre, Golden Jubilee National Hospital, Clydebank, Clydebank, United Kingdom
3. Leeds University and Leeds Teaching Hospitals NHS Trust, Leeds, United Kingdom
4. James Cook University Hospital NHS Trust, Middlesbrough, United Kingdom
5. South Manchester Hospitals NHS Trust, Manchester, United Kingdom
6. Leicester University Hospitals NHS Trust, Leicester, United Kingdom
7. Liverpool Heart and Chest Hospital NHS Foundation Trust, Liverpool, United Kingdom
8. Royal Wolverhampton University Hospital NHS Trust, Wolverhampton, United Kingdom
9. Barts and the London Hospital, London, United Kingdom
10. University Hospital Southampton Foundation Trust, Southampton, United Kingdom
11. Greater Glasgow and Clyde Health Board, Glasgow, United Kingdom
12. Electrocardiography Core Laboratory, University of Glasgow, Glasgow, United Kingdom
13. Department of Haematology, Royal Infirmary, Glasgow, United Kingdom
14. University Hospital Hairmyres, East Kilbride, United Kingdom
15. University of Edinburgh, Edinburgh, United Kingdom
16. Robertson Centre for Biostatistics, Institute of Health and Wellbeing, University of Glasgow, Glasgow, United Kingdom